IDE reprogramming Crumar's MJU by G.M. lab

Projects Programming
1

I am using the IDE to try and reprogram the MJU so I can control my synth keyboard with a midi keyboard.

When following the IDE instructions;
Connect the MJU to your comptuer using the provided USB cable, start the
IDE, load the sketch, then:

  1. From the TOOLS menu, select BOARD -> Arduino Leonardo;
  2. From the TOOLS menu, make sure the selected PORT points to Leonardo;
  3. Click the icon with the arrow pointing right, this will compile the
    sketch and upload it to the board.

I downloaded; GitHub - FortySevenEffects/arduino_midi_library: MIDI for Arduino

Now, how do I find which library to "add" to the IDE?